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Financial risk management - Market risk (Details) ₲ in Millions, € in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2017 USD ($) $ / ₲ $ / € $ / $ | Dec. 31, 2017 EUR (€) $ / ₲ $ / € $ / $ | Dec. 31, 2017 PYG (₲) $ / ₲ $ / € $ / $ | Dec. 31, 2017 ARS ($) $ / ₲ $ / € $ / $ | Dec. 31, 2016 USD ($) $ / ₲ $ / € $ / $ | Dec. 31, 2016 EUR (€) $ / ₲ $ / € $ / $ | Dec. 31, 2016 PYG (₲) $ / ₲ $ / € $ / $ | Dec. 31, 2016 ARS ($) $ / ₲ $ / € $ / $
Financial risk management |  |  |  |  |  |  |  |
Financial debt |  |  |  | $ 12,235 |  |  |  | $ 11,912
Cash and cash equivalents and investments sensitive to changes in Peso/Dollar exchange rates (as a percent) | 66.00% |  |  |  |  |  |  |
Dollar linked investments sensitive to changes in Peso/Dollar exchange rates (as a percent) | 4.00% |  |  |  |  |  |  |
TOTAL ASSETS |  |  |  | 57,588 |  |  |  | 47,914
TOTAL LIABILITIES |  |  |  | (33,709) |  |  |  | (28,036)
Dollar linked investments held |  |  |  | 365 |  |  |  | 74
Net liability position in foreign currency | $ 518 |  |  |  |  |  |  |
Amount of several NDF contracts entered by the group | 60 |  |  |  | $ 16 |  |  |
Currency risk |  |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |  |
TOTAL ASSETS |  |  |  | 7,563 |  |  |  | 4,875
TOTAL LIABILITIES |  |  |  | (18,600) |  |  |  | (14,654)
Net liabilities | (592) |  |  | (11,037) |  |  |  | (9,779)
Net liability position in foreign currency | 578 |  |  | 10,672 | 611 |  |  | 9,705
Net liability position in foreign currency | 518 |  |  | 9,559 | 595 |  |  |
U.S. dollars | Government bonds |  |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |  |
Government bonds at fair value | 12 |  |  | 371 | 45 |  |  | 735
U.S. dollars | Currency risk |  |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |  |
TOTAL ASSETS | 372 |  |  | 7,094 | 241 |  |  | 4,067
TOTAL LIABILITIES | $ (939) |  |  | $ (17,568) | $ (859) |  |  | $ (13,648)
Exchange rate, assets | $ / $ | 18.549 | 18.549 | 18.549 | 18.549 | 15.790 | 15.790 | 15.790 | 15.790
Exchange rate, liabilities | $ / $ | 18.649 | 18.649 | 18.649 | 18.649 | 15.890 | 15.890 | 15.890 | 15.890
G | Currency risk |  |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |  |
TOTAL ASSETS |  |  | ₲ 120,029 | $ 399 |  |  | ₲ 250,865 | $ 684
TOTAL LIABILITIES |  |  | ₲ (233,891) | $ (773) |  |  | ₲ (311,279) | $ (848)
Exchange rate, assets | $ / ₲ | 0.003 | 0.003 | 0.003 | 0.003 | 0.003 | 0.003 | 0.003 | 0.003
Exchange rate, liabilities | $ / ₲ | 0.003 | 0.003 | 0.003 | 0.003 | 0.003 | 0.003 | 0.003 | 0.003
EURO | Currency risk |  |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |  |
TOTAL ASSETS |  | € 3 |  | $ 70 |  | € 7 |  | $ 124
TOTAL LIABILITIES |  | € (11) |  | $ (259) |  | € (9) |  | $ (158)
Exchange rate, assets | $ / € | 22.283 | 22.283 | 22.283 | 22.283 | 16.625 | 16.625 | 16.625 | 16.625
Exchange rate, liabilities | $ / € | 22.450 | 22.450 | 22.450 | 22.450 | 16.770 | 16.770 | 16.770 | 16.770

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